Nuclear Grade Hafnium vs. R30035 Cobalt

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while R30035 cobalt belongs to the cobalt alloys. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is R30035 cobalt.

Nuclear Grade (Grade R1) Hafnium UNS R30035 (2.4999) Co-Ni-Cr-Mo Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		78
Elastic (Young's, Tensile) Modulus, GPa		220 to 230

Elongation at Break, %		25
Elongation at Break, %		9.0 to 46

Poisson's Ratio		0.26
Poisson's Ratio		0.29

Shear Modulus, GPa		31
Shear Modulus, GPa		84 to 89

Tensile Strength: Ultimate (UTS), MPa		350
Tensile Strength: Ultimate (UTS), MPa		900 to 1900

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g		130
Latent Heat of Fusion, J/g		320

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		440

Thermal Expansion, µm/m-K		5.9
Thermal Expansion, µm/m-K		13

Otherwise Unclassified Properties

Density, g/cm³		13
Density, g/cm³		8.7

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		73
Resilience: Ultimate (Unit Rupture Work), MJ/m³		160 to 320

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		210 to 5920

Stiffness to Weight: Axial, points		3.3
Stiffness to Weight: Axial, points		14 to 15

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		23 to 24

Strength to Weight: Axial, points		7.4
Strength to Weight: Axial, points		29 to 61

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		24 to 39

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		23 to 46

Alloy Composition

Boron (B), %		0
Boron (B), %		0 to 0.015

Carbon (C), %		0
Carbon (C), %		0 to 0.025

Chromium (Cr), %		0
Chromium (Cr), %		19 to 21

Cobalt (Co), %		0
Cobalt (Co), %		29.1 to 39

Hafnium (Hf), %		99.8 to 100
Hafnium (Hf), %		0

Iron (Fe), %		0
Iron (Fe), %		0 to 1.0

Manganese (Mn), %		0
Manganese (Mn), %		0 to 0.15

Molybdenum (Mo), %		0
Molybdenum (Mo), %		9.0 to 10.5

Nickel (Ni), %		0
Nickel (Ni), %		33 to 37

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.015

Silicon (Si), %		0
Silicon (Si), %		0 to 0.15

Sulfur (S), %		0
Sulfur (S), %		0 to 0.010

Titanium (Ti), %		0
Titanium (Ti), %		0 to 1.0

Residuals, %		0 to 0.23
Residuals, %		0